John agbell and john klbpzig



No. 68,406. PATBNTED SEPT. 3,' 1867. J. AGRELL L J. KLEPZIG. FURNACE POR'ROASTING GRES.

@uiten gitana iatent JOHN AennLL ANI). JOHN KLEPZIG, CF sAN FRANCISCO, CALIFORNIA. i Letters Patent No. 68,406, dated September 3, 18672 i IMPROVED FURNAGE FOB. ROASTING DRES.

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TO ALL WHOM IT MAY CONCERN:

Beit known that we, JOHN ACRELL and Jon-N KLurzIe., of San Francisco city, San Francisco county, State of California, have invented certain new and useful Improvements vin Furnaces for Roasting Orcs; and we do hereby declare the following description and accompanying'drawings are suicient to enable any person skilled in the nrt or science to which it'most nearly appertains to make and use our said invention or improvements without further invention or experiment. V

i The nature of our invention lis to provide an improved furnace for roasting ores, by the use of which much labor which is now necessary may be dispensed with, and .the furnace bc rendered mechanical, .while the ore is thoroughly roasted. To cifect this we provide a reverberatory furnace, but instead of having the hearthstational-y it is so constructed 'as to revolve horizontally, while a series of stationary stirrers expose the ore to the4 action of the heat, so that all parts of it will .becoIn-s thoroughly roasted. l To more fully explain our invention reference is had to the accompanying drawings, forming a part of this specification, 'of which- I Figure 1 is a side `elevation;

Figure 2, a side sectional elevation.

Figure 8, a top view of the hearth.

Figure 4, a bottom view of the stirrers Figure 5, an end view.

Similar letters indicate like parts in each of the figures. v

A. is the .body of the furnace, having the rire-place B, connecting over the bridge with thc space C, having an arched roof'to reflect the heat and ilanie down upon the hearth D and its contents. This hearth may be made of iron and lined with brick, stone, clay, or any other substance that will resist the action of the heat. The hearthis provided with the low partitions I I across the bottom and J J at the sides to keep the lining in place, the spaces between .T Jbeing sufficient to admit a brick. The hearth is supported on the rollersE-Eand is revolved by the uprightv shaft F and the bevelled wheels Gr and H. The rollers set in agroove in the bottom of the hearth, which keep it in place. K- is a sliding-door or plate in the bottom of the hearth by which the roasted ore is discharged, and is kept in its place, when closed, by the lever-like handle L, theouter end of which ishheavy enough to keep the inner ond pressed into an opening in the side of the hearth. When itI is necessary to open the slide the handle L is simply raised by means of a. hook and the whole drawn out. A shaft, N, extends over the hearthdia'gonally ata little distance from the surface of the ore. This shaft supports the cylindrical pieces O, to which are attached the stirrers P'. The stirrers are kept in place by the projections ai,

gll, and permanent feathers b, but when it is necessary to remove them, by simply turning the pieces O tillthe projections d are disengaged, they may be slipped oi` over the end of the shaft vN. This shaft is made hellowpso that bymakingjet-holes in it steam can be introduced at pleasure to assist the process. The bottoms of thestirrers P are made convex so as to pass over 'any resistance that I night'break them in lifting up and 'passing over it. M M are the hoppers, through which the furnace is fed or charged. S .S are projections on -each end, which serve to keep the shaft from" turning. R is a hook or catch, which holds one end, and which being raised allows the shaft tobe removed in case of breakage or wear. The bar T, which holds the catch R,

and also the' roller W, is secured by thc strengthening straps of the furnace V V. The roller Wis used to support the rakc used in discharging the orc after the process is completed.

In using this furnace, it is heated up and the hearth set in motion. The ore to be roasted is then fed in through Athe't-wo hopper's M M till the hearth is charged. It may lthon be left with very little attention till the roasting is completed, when the hcarthis stopped with the opening -in vthe position toward the side shown in g. 1, and the ore raked out, when a ner.' charge can be introduced and the work go on. Ono man can easily .attend to four of these furnaces, and the work will be much morethoroughly-donc than when the ore is stirred 'by hand and at intervals, as is done at present.

Having thus described our invention, what wc claim, and desire to securcby Letters Patont is A furnace-for roasting orcs, ctc., provided with a rotating hearth, with lthe iire acting onilts upper surface,

I as described.

We also claim providing a rotary hearth with a door to discharge the ores or contents acted on by the fire.

We claim mounting the rotating hearth of a. reverberatory furnace on rollers, substantially :Ls described. We also claim providing therevolving hearth with partitions to hold the brick lining in place. And, in combina-tion with the rotating hearth, we claim the stationary stirrers We also claim making the sha-ft which holds the stirrers hollow for the purpose of supplying steam to the ores roasted on the hearth.

n witness whereof we have hereunto set our hands and seals.

JOHN AGRELL. [L sf] JOHN KLEPZIG. [L. 5.]

Witnesses:

C. W. M. SMITH, GEO. H. SrRoNG. 

